WN 3565 then B6 1187 at Boston
St Louis → Boston → Los Angeles
Timetable, Boston time
18:05WN 3565 from St Louis at the gate
15:45B6 1187 to Los Angeles leaves the gate
21 h 40 apart on the timetable, overnight
B6 1187 leaves 21 h 40 after WN 3565 arrives on the timetable: more than half a day, so not a connection we count.